Maintenance Manual STEMME S10
Date of Issue: Oct. 01, 1990 page: 37
Amendment No.: - Date: -
A4010021_B19.doc
Doc.No.: A40-10-021
7.3.6 Controls/Instruments
The bowden cables for power and choke setting can be adjusted on the carburettors and/or at the
attachments to the power and choke control levers in the cockpit.
The power plant instruments do not require maintenance. Summary: see Equipment List.
Zero calibration of the cylinder head temperature indicator is based on 20°C (temperature of the refer ence
point, i.e. the soldered joints connecting the lines from the instrument to the thermocouples inside the
fuselage).
7.3.7 Fire Protection
Retouching of damaged coating: Remove damaged area down to the laminate, apply three layers of fire
protection paint and cover with clear varnish.
7.3.8 Engine Cowlings
Sealings on air ducts must be in close contact with the engine and oil cooler respectively. Replace them in
case of embrittlement.
7.3.9 Propeller
Tolerances:
− Track of propeller joints (blade suspension) with reference to the position "upper left transmission gear
mounting": maximum difference of 0.012 in. (0.3 mm) between both joints.
− Track of propeller blade tips: maximum difference of 0.12 in. (3 mm) between the blades.
− Play of blade tips in flight direction: maximum of 0.16 in. (4 mm) total.
− Unbalance: Basic Balancing by the manufacturer. Precission balancing by a knowledgeable person by
adjusting the compensation masses at the blade root by a maximum of 1.13 dr. (2 g).
Removal of the propeller:
− Removal of the propeller dome: lift off left and right leg room covering in the cockpit. Loosen clamping
screw on the stay tube of the propeller dome, pull out locking screw, remove static pressure hoses,
withdraw propeller dome to the front.
− Loosen fastening screws, remove propeller.
Installation of the propeller:
− Clean and degrease the propeller and the transmission gear flange with an appropriate solvent. The
torque is transmitted by friction fit, therefore, the surfaces must be even, clean and free from grease.
− Inspect threaded bushes in the transmission gear flange for visible damage.
− Tighten the fastening screws by means of a torque wrench in two steps:
1st step: tightening torque: 74 lbft. (10 Nm);
2nd step: tightening torque: 220 lbft. (30 Nm).
Afterwards, lock 3 screws at a time with a safety wire.
− Check the tolerances.
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